robots.txt file is stopping google from accessing my blog - how do I delete it?

This file is on my wordpress blog: http://holfordwatch.info/robots.txt. It's stopping google from indexing the blog, and I presume other search engines too. Any idea how I get rid of, or change, this file.

My privacy options are set so that the blog should be indexable by search engines.

Yes, that is the default robots.txt file on all WordPress.com blogs. Since I don't have access to your Google webmaster account (which is I assume what you are talking about), I can't really comment on the "not found" messages.

It appears that the directory /next/ on our WP.com sites contains whatever is necessary for the Next button in the bar at the top of your screen when you are surfing wp.com. It shouldn't be crawled and therefore is blocked.

I am not staff and am only making an educated answer based on past experience. From what it says in the robots.txt file, the "next" directory is blocked to all Bots. The IRLbot apparently crawls sites too frequently, so it's been told that it can't crawl more than once every 3600 seconds.

There's really not much we can do in changing our robots.txt file other than setting up our preferences to allow our blogs to be searched by search engines, etc. under the Options/Privacy tab in our Dashboard. Make sure yours is set to allow it. All the rest is under the hood and not accessible to users.

It's not a matter of trusting anyone. You post asking a question, we do our best to answer. We're volunteers; we don't claim to know everything but most of us have been using WP for a while and like to help newer users. And generally we don't post in a thread unless we have a good idea of what we're talking about. If you're not sure about something we say, wait to hear back from staff instead. That's your choice.